R help - Jun 2012 - Size of subsample in ecodist mantel()

What is the size of the boostrapped subsample in  ecodist mantel()

thanks

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Dear list-members,

I have done optimization of 3 parameters by maximum likelihood method using
conjugate gradient as optimizer. Since I have the reported value of the
parameters from an article, I can validate the result of the optimized
parameters. The problem is that optimizer converges to the desirable value. (as
reported in the article) only for a certain starting value.

If the staring value of the parameters are like (2,1,1) then the value of
parameters the function converges is
$par
[1] -0.4169408 -0.2800828  2.9614670

And the value is close to the value of article reported in the article
Vs = 0.4861 ; Vn = 0.1478 and m is some positive value (no value mentioned in
the article)

And If I fine tune the starting value from (2,1,1) to (1.949,1.13,1) then I get
the value of the parameters very close to the one reported.

$par
[1] -0.4700892 -0.1428245  2.9614670

Now the question is how I can find the starting values for the test experiment
for which I am going to implement this optimization procedure.
Is there any function to be wrapped with optim() to find the right starting
value.



Regards,
B.Nataraj

You can set it using the pboot argument.

Sarah

On Thursday, June 28, 2012, nevil amos wrote:
> What is the size of the boostrapped subsample in  ecodist mantel()
>
> thanks
>
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>
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-- 
Sarah Goslee
http://www.stringpage.com
http://www.sarahgoslee.com
http://www.functionaldiversity.org

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